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This change rolls the hermetic Xcode to 11.2.1 aka 11B53, with the
10.15 SDK.

Bug: 1023913
Change-Id: I072a57b5f9c93bc08984b05d0de3ea62886a59dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1964531Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#725141}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1993723
Cr-Commit-Position: refs/heads/master@{#730238}